Apparatus for bending metal tubes, rods, and the like.



No. 804,732. PATENTED NOV. 14, 1905. W. KENNEDY; APPARATUS FOR BENDINGMETAL TUBES, RODS, AND THE LIKE.

APPLICATION FILED OUT. 6,1904.

UNITED STATES PATENT ori ron.

APPARATUS FOR BENDING IVIETALTUBES, RODS, AND THE LHKE.

Specification of Letters Patent.

Patented Nov. 14, 1905.

Application filed October 6, 1904:. Serial No. 227,390.

To all whom it may concern.-

Be it known that I, WILLIAM KENNEDY, mechanic, a subject of the King ofGreat Britain and Ireland, residing at 4 Furzeham road, West Drayton, inthe county of Sussex, England, have invented certain new and usefulImprovements in Apparatus for Bending Metal Tubes, Rods, and the Like,of which the following is a specification.

This invention relates to an apparatus by means of which a metal tube,rod, or the like may be bent or set when cold to any required anglewithout producing undue expansion,flat tening,or bulging of any partofthe tube or rod.

The apparatus and the method of using it will be described withreference to the accompanying drawings, in which- Figures 1 and 2 arerespectively an elevation and a plan, and Figs. 3, 4, and 5 are detailsof the apparatus.

A hollow mandrel or tube A,which is screwthreaded internally, isprovided at its ends with flanges C 0, one of which is adapted to besecured to a bench or other fixture. A second hollow mandrel or tube D,screwthreaded externally, is screwed into the upper portion of themandrel A to a depth sufficient to support it effectively during thebending process and secured in that position by pins D. A nut E ofspecial construction is fitted on the tube D and the pipe or rod to bebent is clamped between the nut and the flange C. The nut isring-shaped, and its under surface corresponds in size and is parallelto the upper surface of the flange C. A number of blocks G (four areshown in the drawings) are fixed to the upper surface of the nut E orformed integrally therewith and are so disposed that by means of the keyI the nut may be thereby screwed firmly home, so as to clamp the pipe Fsecurely, or unscrewed to free the pipe, as indicated in dotted lines inFig. 2.

A cored plug or bush H is fitted into the upper end of the mandrel D, sothat when the pipe F is clamped in position it maybe bent by insertingthe pin 1 of the key I into the hole of the plug H and turning the keyround until the grooved corner J of the key-head encounters the tube F.The latter is then bent by the leverage which can be applied by the keyround the annular block L, which encircles the mandrel D eitherpartially or wholly, the angle through which it is bent being indicatedby the angular traverse of the corner J round the edge of the flange C,

which may be provided with a scale for that purpose. The flange C isalso preferably provided with adjustable stops K, which may be securedin segmental slots K in the flange by means of clamping-bolts for thepurpose of limiting or gaging the angle through which a pipe is bent.Further, the curvature of the bend may be varied by means of blocksconsisting of ring-segments or collars L of varying thickness, by whichthe effective diameter of the mandrel D may be altered. Then the pipe tobe bent has very thin Walls, these rings are preferably provided withperipheral grooves L, as shown in Fig. 1, the groove on the ring in usebeing of the same curvature as the pipe to be bent; but for most pipesitwill not be necessary to have grooves in the blocks L.

Instead of bolting the flange C direct to a bench it may be fixed to abeam B, of wood or other suitable material, which is pivotally mounted.as at B, on a bench B and serves as a counter-lever in the bendingoperation.

Having thus described the nature of this invention and the best means Iknow of carrying the same into practical effect, I claim 1. Apparatusfor bending metal tubes or rods comprising a fixed pipe having a heavyflange, an eXternally-screw-threaded hollow mandrel secured in the fixedpipe and provided with a clamping-nut, a cored plug in the end of saidhollow mandrel adapted to receive the pin of a bending-lever,substantially as described.

2. Apparatus for bending metal tubes or rods comprising a fixed pipehaving a heavy flange, an externally-screw-threaded hollow mandrelsecured in the fixed pipe, a clampingnut on the said mandrel havingblocks on its upper surface and a key adapted to engage the said blocksand turn the clamping-nut, substantially as described.

3. Apparatus for bending metal tubes or rods comprising a fixed pipehaving a flange at one end, a mandrel secured in the said pipe, rings ofvarious thicknesses adapted to fit round the said mandrel, means forclamping a pipe or rod on the flange and means for bending the said pipeor rod through any required angle, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM KENNEDY.

Witnesses:

JOSEPH MILLARD, W. M. HARRIS.

